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Check it there: http://developer.nvidia.com/object/cuda_3_1_downloads.html
Did not find new features since 3.1beta, just bug fixes. 2D surface write intrinsics that were buggy in 3.1 Beta are now working for instance.
There is also a reference to GPUDirect in the "release highlights", but I did not find any documentation for it. GPUDirect seams to allow third party devices to do direct memory acces to the GPU memory (cf the anouncement here).

2 Comments for "CUDA 3.1 Final out"

Je viens de mettre aussi à jour ma version de CUDA mais malheureusement j'ai une erreur récurrente que ça sur la compilation de mes codes ou de la SDK de Nvidia.[code]/usr/include/surface_functions.h: In function ‘void surf1Dread(T*, surface, int, int, cudaSurfaceBoundaryMode)’:/usr/include/surface_functions.h:100:95: erreur: there are no arguments to ‘__surf1Dreadc1’ that depend on a template parameter, so a declaration of ‘__surf1Dreadc1’ must be available/usr/include/surface_functions.h:100:95: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)/usr/include/surface_functions.h:101:96: erreur: there are no arguments to ‘__surf1Dreads1’ that depend on a template parameter, so a declaration of ‘__surf1Dreads1’ must be available/usr/include/surface_functions.h:102:94: erreur: there are no arguments to ‘__surf1Dreadu1’ that depend on a template parameter, so a declaration of ‘__surf1Dreadu1’ must be available/usr/include/surface_functions.h:103:94: erreur: there are no arguments to ‘__surf1Dreadu2’ that depend on a template parameter, so a declaration of ‘__surf1Dreadu2’ must be available/usr/include/surface_functions.h:104:95: erreur: there are no arguments to ‘__surf1Dreadu4’ that depend on a template parameter, so a declaration of ‘__surf1Dreadu4’ must be available[/code]